How to weld on 911 bumper shock

[Andy Somogyi]

Hey all.

I need to weld on an extension piece onto my 911 bumper shock, only about 14mm wide.

But the issue is how do I keep the shock cool while I’m welding the piece on? I don’t want to take the temper out of the spring inside.

Luckily this is a 76 shock, so it’s just a plain tube with a spring and some oil, and as soon as you cut off the rubber, the oil just drains out.

Wonder if I should try to submerge the entire thing while I weld it???

I’ll be using a TIG to weld.


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[James Brown]

small beads about 1" apart, wait 5-10 between beads till its all stitched together. a spritz bottle of water should cool things off. What is your project?

[Andy Somogyi]

Originally Posted by James Brown

small beads about 1" apart, wait 5-10 between beads till its all stitched together. a spritz bottle of water should cool things off. What is your project?

I was thinking about submerging in a bucket of water while I weld it, not sure if that’s an incredibly stupid idea or not.

I’m converting my bumper to look like a 911 SC/RS because I like that smooth look, and I want to keep the safety and structural support of the aluminum bumper instead of a fiberglass cover.

So, I need to raise the bumper a 1/2” to fit flush with the fender so can use a 964 style bumper smile.

I’m also fitting a front mounted radiator in preparation for a Subaru swap.

Here’s the start of a build page:

https://facebook.com/ArrowBlau


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[chrisbalich]

i'd advise against welding on anything submerged in water. sounds like a great way to electrocute yourself.
if you're going to TIG it, you should be able to control the heat pretty easily. plus the location of your ground (on the work piece) will dictate the flow of electricity and therefore the flow of heat. if you use a welding table and plan to just contact ground through the worktop, prop the shock end up on a piece of copper or aluminum as they dissipate heat faster than steel and that should help keep the shock cooler.

[75 911s]

Also as I mentioned on the fb page, order two front rennline euro crush tubes. Impact safety is there and you save several pounds and you don't have to worry about boiling the hydrualic fluid. Also, you could section the euro tubes easy if you want to tuck that front bumper.

[QueWhy]

Originally Posted by 75 911s

Also as I mentioned on the fb page, order two front rennline euro crush tubes. Impact safety is there and you save several pounds and you don't have to worry about boiling the hydrualic fluid. Also, you could section the euro tubes easy if you want to tuck that front bumper.

I'd follow this advice. The euro tubes will be easier to work with plus the bumper is going to look goofy with the 964 smile if it isn't tucked, the proportions will be off.

Also I wouldn't put so much faith in 40 year old crash technology. Modify what you need to achieve the look you are going for and just don't rear-end anyone.

[75 911s]

They work great for impacting cars with bumpers 15 inches off the ground and under 5mph. lololol. Otherwise that SUV bumper is going right up onto your hood and through the glass.